: Pictured below is something that has worked well for me.

: The strip back-rest is a bit of deck left over from an old cockpit
: cutout with some camp-mattress glued onto it. Joining the
: backrest to the bulkhead is a rubber windsurfing universal joint
: which allows the backrest to adjust to the optimum angle.

: Et

Great idea ... that was the sort of thing I remembered seeing. Thank you.